How can I connect multiple bones to one?
Bones 1,2,3,4,5,suspens, are all child of bone "control", which can move up and down and rotate left/right. 

Suspens has a "stretch to" constraint pointing to "car" bone. Bones A,B and C have a "stretch to" constraint pointing at 2,1 and 5.

Car and Car2 are parented also.